Amplifier



FIG. 1 is a front isometric view of an amplifier, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevation view thereof; and,

FIG. 7 is a right side elevation view thereof.

The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for an amplifier, as shown and described. 